Bush Hog 280 manual Slip Clutch Adjustment, Problem Probable Cause Remedy

turning blades. If clutch does not slip, contact your authorized Bush Hog dealer.

C. Retighten nuts to within 1/64” of original posi- tion. Initial spring length is shown in Figure 4-3.

WARNING

OVERTIGHTENING SPRING NUTS MAY CAUSE DAMAGE TO IMPLEMENT AND/OR TRACTOR DUE TO INCORRECT SLIP CLUTCH TORQUE SETTING. ALWAYS FOLLOW THE PROPER ADJUSTMENT PROCEDURE.

4-6 SLIP CLUTCH ADJUSTMENT

The slip clutch is factory preset to the correct torque for protecting implement and tractor. Periodic adjustment is recommended; refer to section 4-5. Should adjustment be needed, first check to be sure all spring lengths are the same. Initial spring length is shown in Figure 4-3. If necessary, adjust nut on any spring that is unequal. Adjust all eight spring retaining nuts 1/3 of a turn (2flats on a nut) and check clutch slippage. If further adjustment is neces-

sary, do so in 1/3 turn increments. Adjust only to provide sufficient torque to prevent slippage under normal conditions. Occasional slippage is normal for drivetrain protection. If satisfactory results cannot be obtained, consult your Bush Hog dealer.

IMPORTANT

Do not overtighten nut and cause spring to become solid as this will cause shaft to fail.

(See

Figure 4-3Chart) Spring Length

	MODEL	SPRING LENGTH
285 &286		1-3/32” or 27.6 mm
287		1-1/8” or 28.5 mm

Table 4-1 General Troubleshooting

PROBLEM	PROBABLE CAUSE	REMEDY
Uneven Cut	Cutter not level side to side.	See SECTION II
	Worn or bent blades.	Replace blades per paragraph 4-4.
Stripping or Windrowing	Possible build-up of material under	Clean cutter.
	cutter.
	Cutter not level.	Refer to Section II.
	Worn blades.	Replace per paragraph 4-4.
Noisy Cutter	Loose components.	Check al bolts for tightness per
		paragraph 20.
	Low oil in gearboxes.	Check for proper oil level. Refer to
		paragraph 4-2.
Rapid Blade Wear	Blade contacting the ground.	Adjust cutter to operate at a height
(Cutting Edge)		that will eliminate ground contact.
Rapid Blade Wear	Cutter not being operated at	Reduce ground speed.
(Bolt Hole)	rated RPM speed.	Set tractor throttle for proper PTO
		speed.
	Too much ground speed.	Use lower gear.
Poor Shredding Job	Incorrect deck tilt.	Adjust per paragraph 3-2.
	Excessive ground speed.	Reduce ground speed.
	Worn blades.	Replace blades per paragraph 4-4.
Cutter Vibration	Cutter not being operated at rated	Set tractor throttle for proper PTO
	RPM speed.	speed.
	Possible build up of material on	Clean blade pan.
	blade pan.
	Broke blade.	Replace blades per paragraph 4-4.
	Blades unequal weight.	Replace blades per paragraph 4-4.

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